Abstract
Taking the Planetary Bevel Gears as an object, the characteristic of cold Closed-die Forging was studied. By Using the FEM, the flowing rule of metal in the process of cold forging were analyzed, which is composed of dual-direction extrusion, upsetting and filling the gear form. The results show that each district of cavity was filled completely at the end of forging, without corner collapse, fold or crack. Taken the lower die as an example, the distribution of die stress was also analyzed. The results of numerical simulation were proved by the experiments, meanwhile the high precision and quality forging was formed. To the gears, the cold closed-die forging can not only ensure the dimensional precision, but also improve the capability of the gear, while obviously reduce materials consumption.
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